I am using Paypal Subscriptions feature in my .Net MVC application. I am creating Paypal plans and agreements using .Net SDK (C#.net). I need C# code that can upgrade or downgrade an existing Paypal subscription. I have read Paypal documentation, but didn't get C# code to update Paypal subscription. I am using the following version of .Net SDK. https://github.com/paypal/PayPal-NET-SDK
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